24 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Oakdale | Washington County | 30,983 |
| Owatonna | Steele County | 26,679 |
| Otsego | Wright County | 24,799 |
| Oak Grove | Anoka County | 9,421 |
| Orono | Carver County | 8,209 |
| Oak Park Heights | Washington County | 4,631 |
| Osseo | Hennepin County | 2,489 |
| Olivia | Renville County | 2,295 |
| Oronoco | Olmsted County | 2,097 |
| Ortonville | Big Stone County | 1,957 |
| Osakis | Douglas County | 1,741 |
| Onamia | Mille Lacs County | 843 |
| Ottertail | Otter Tail County | 742 |
| Oklee | Red Lake County | 405 |
| Ogilvie | Kanabec County | 402 |
| Oslo | Marshall County | 238 |
| Ostrander | Fillmore County | 224 |
| Orr | St. Louis County | 212 |
| Ogema | Becker County | 204 |
| Okabena | Jackson County | 200 |
| Osage | Becker County | 183 |
| Odin | Watonwan County | 123 |
| Ormsby | Martin County | 123 |
| Odessa | Big Stone County | 102 |